material texture won't show up
You are in solid preview mode. If you look, there are 4 little circles in the top-right of your viewport that represent the different preview modes (From left to right - Wireframe, Solid, Material Preview, Rendered Preview) - to view your textures, pick one of the two rightmost ones (Material Preview, or Rendered Preview). You can also press Z in the viewport and pick the correct preview mode from the pie menu that appears.